The case came up before Justice Gautam Patel today.
Sena president Uddhav Thackeray has filed 'a probate petition' in the HC to get his father's will certified.
Jaidev, who does not get any property under the will, has opposed the probate and questioned the validity of the will, saying that his father could not have left him out of his will.
The court has turned the probate proceedings into a 'testamentary suit'.
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Uddhav, who took over as Shiv Sena president after his father's death in November 2012, is one of the beneficiaries.
The properties left behind by Thackeray are worth Rs 14.85 crore and include his iconic bungalow in suburban Bandra, 'Matoshri'.
Jaidev has also alleged that Uddhav, being the leader of a political party, would use his influence to get the will executed. He also says that his father's properties were worth much more than what is stated in the probate petition and 'Matoshri' itself is worth Rs 40 crore.
Dr Jalil Parkar, Bal Thackeray's personal physician, is the witness in whose presence he signed the will.